Circuit and method for detecting turn-to-turn short circuit fault of reactor

Abstract

The invention discloses a circuit and a method for detecting a turn-to-turn short circuit fault of a reactor. The circuit comprises a power supply, a switch, a voltage transformer, a current transformer, a reactor, a capacitor and the power factor measurement module. The power factor measurement module comprises a high-resolution power factor measurement device and a server. The high-resolution power factor measuring device is communicated with the server through a network cable, a primary winding of the voltage transformer is connected to two ends of the power supply and is connected with thereactor in parallel, and a secondary winding of the voltage transformer is connected to the high-resolution power factor measuring device. A primary winding of the current transformer is connected totwo ends of the power supply and is connected in series with the reactor, and a secondary winding of the current transformer is connected to the high-resolution power factor measuring device. The reactor is connected with the capacitor in parallel. The method is implemented by the circuit. The method is sensitive and accurate, the operation safety can be ensured, the reactor can operate under therated voltage, and the negative influence caused by the deviation of the overall measurement circuit is avoided.

Description

technical field [0001] The invention belongs to the field of reactors, in particular to a circuit and method for detecting short-circuit faults between turns of reactors. Background technique [0002] Turn-to-turn short-circuit fault is a fatal failure of reactors, and reactors with inter-turn short-circuit faults will burn out or even ignite. At present, the common method used by power companies to detect reactors and judge whether there is an inter-turn short circuit fault in the reactor is: measure the DC resistance or inductance value, compare the measured value with the value on the nameplate of the reactor, and if the deviation exceeds the range specified in the standard, it is determined that the reactor is faulty. Fault. However, due to the large number of coil turns of the reactor, if only a very small number (for example, only 1 turn) of the coils has a short-circuit fault, the DC resistance value and inductance value of the reactor will change very little, and it...

AI Technical Summary

Problems solved by technology

However, due to the large number of coil turns of the reactor, if only a very small number (for example, only 1 turn) of the coil has a short-circuit fault, the DC resistance value and inductance value of the reactor will change very little, and it is almost impossible to find the fault

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